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Mohammad Hossain 5Mohammad Hossain 5 

Your Developer Edition comes with a System Administrator user. Create a new user using the System Administrator profile and then deactivate that user to preserve the licenses in your org.

Amit Chaudhary 8Amit Chaudhary 8
Are you working on trailhead module ? if yes then please check below post for same module
1) https://developer.salesforce.com/forums/?id=906F0000000BVnjIAG

NOTE:- Every developer edition org should have two salesforce licenses and both of them can have the System Administrator profile.

You have to create new user with salesforce licenses and select profile as system administrator for new guest user.
setup --> manageuser -->User-->  New user --> select  user license as salesforce and profile as system administrator

To deactivate the existind admin user goto 
setup --> manageuser -->User--> click edit new to existing admin user and uncheck the Active button


Let us know if this will help you
Vasani ParthVasani Parth
Mohammad,

Every Dev org gives you two full salesforce licenses to use. 
Create a new user using the System Administrator profile and then deactivate that user to preserve the licenses in your org.
Did you assign the System Administrator profile to your user?

1. You need to the Set the User License to Salesforce.
2. Now change the Profile to be System Administrator.
3. Then proceed with the rest of the steps.

Please mark this as the best answer if this helps